But there is a difference between using chromatics and composing from a so called chromatic scale. Flight of the Bumble Bee encompasses many chromatic passages...but I would not say that the melody is composed from the chromatic scale.
Schoenbergs tone row system cannot really be defined as composing from a chromatic scale becuase there is no defined order to the notes,,,except that created by the composer. This type of music can hardly be defined as so, since it lacks many qualities that we use to define music. It's more of a lackluster game for the artistically declined.
Chromatics are nothing more then approach tones that have to be resolved.